Many services are delivered to a (large) number of customers simultaneously within a confined zone (e.g., restaurants, resorts, trains, and airplanes). Under unexpected high demand, customers experience discomfort from two major sources: (a) the sardine effect that arises when too many customers...

Service providers and their customers are sometimes victims of failures caused by exogenous factors such as unexpected bad weather, power outages, or labor strikes. When such no-fault failures occur in confined zones, service providers may confine customers against their will if making...

Service providers and their customers are sometimes victims of failures caused by exogenous factors such as unexpected bad weather, power outages, or labor strikes. When such no-fault failures occur in confined zones, service providers may confine customers against their will if making...

Service shutdowns -- extended disruptions of operations -- caused by exogenous events are on the rise. Such shutdowns pose major challenges for service providers, customers, and policymakers. Providers tend to push for vouchers as a means of service recovery to limit bankruptcy risk, whereas...

Search advertising marketplace is highly competitive in nature. As such, advertisers have to consider their competitors' responses when making advertising decisions, which concern both bid determination in individual keyword auction instances, and budget allocation over time at the aggregate...

We address the question of whether people have unique signatures - or clickprints - when they browse the Web. The importance of being able to answer this can be significant given applications to electronic commerce in general and in particular online fraud detection, a major problem in...

In sponsored search advertising, keywords serve as an essential bridge linking advertisers, search users and search engines. Advertisers have to deal with a series of keyword decisions throughout the entire lifecycle of search advertising campaigns. This paper proposes a multi-level and...